This tube looks exactly like the picture - it has a matte finish that is less likely to scuff and stain than the more common 'glossy' CF finishes which are visually better looking but much easier to damage. .In terms of size, it's pretty damn close. I measured 20.10 x 18.03 millimeters. So it differs from the nominal 20x18 only by the thickness of the paper. Tip - If you're cutting, I recommend a grinding wheel. Do not use laser (melting) or water jet (fabric tearing) or mill-turn (fabric tearing) machines. Abrasive is the way to go IMO.